Mathematics, 07.05.2021 21:30, reinasuarez964
Researchers conduct a study where subjects read a passage of text while listening to music. Roughly half of the subjects are randomly assigned to listen to music with lyrics, while the rest listen to music without lyrics. After reading, each subject takes a comprehension test. The researchers wish to test if the mean comprehension score for the group without lyrics is higher than those with lyrics.
1. Which of the following is the most appropriate test and alternative hypothesis?
A. Two-sample z-test with HA: μlyrics≠μwithoutμlyrics​​=μwithout​
B. Two-sample z-test with HA: μlyrics<μwithoutμlyrics​<μwit hout​
C. Two-sample t-test with HA: μlyrics≠μwithoutμlyrics​​=μwithout​
D. Two-sample t-test with HA: μlyrics<μwithoutμlyrics​<μwit hout​
E. Paired t-test with HA: μdiff≠0μdiff​​=0
F. Paired t-test with HA: μdiff>0μdiff​>0
2. Which of the following is the most reasonable approximation to the degrees of freedom?
a. 51
b. 49
c. 50
d. 48
e. 52
f. None of the above
Answers: 3
Other questions on the subject: Mathematics
Mathematics, 21.06.2019 22:30, 19thomasar
Atotal of 766 tickets were sold for the school play. they were either adult tickets or student tickets. there were 66 more student tickets sold than adult tickets. how many adult tickets were sold?
Answers: 1
Mathematics, 21.06.2019 22:30, thelonewolf5020
Amachine that produces a special type of transistor (a component of computers) has a 2% defective rate. the production is considered a random process where each transistor is independent of the others. (a) what is the probability that the 10th transistor produced is the first with a defect? (b) what is the probability that the machine produces no defective transistors in a batch of 100? (c) on average, how many transistors would you expect to be produced before the first with a defect? what is the standard deviation? (d) another machine that also produces transistors has a 5% defective rate where each transistor is produced independent of the others. on average how many transistors would you expect to be produced with this machine before the first with a defect? what is the standard deviation? (e) based on your answers to parts (c) and (d), how does increasing the probability of an event a↵ect the mean and standard deviation of the wait time until success?
Answers: 3
Mathematics, 22.06.2019 00:30, def88
Efficient homemakers ltd. makes canvas wallets and leather wallets as part of a money-making project. for the canvas wallets, they need two yards of canvas and two yards of leather. for the leather wallets, they need four yards of leather and three yards of canvas. their production unit has purchased 44 yards of leather and 40 yards of canvas. let x be the number of leather wallets and y be the number of canvas wallets. draw the graph showing the feasible region to represent the number of the leather and canvas wallets that can be produced.
Answers: 1
Do you know the correct answer?
Researchers conduct a study where subjects read a passage of text while listening to music. Roughly...
Questions in other subjects:
Mathematics, 16.01.2021 08:00
Mathematics, 16.01.2021 08:00
Mathematics, 16.01.2021 08:00
